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Table of Contents | December, 2016  Vol. 54   No.12 Previous Issue | Next Issue | Archive
In this issue:


Review Paper
862 Technical Developments and Trends of Earthquake Resisting High-Strength Reinforcing Steel Bars
내진용 고강도 철근의 제조와 기술 개발 동향
Byoungchul Hwang, Jae-Hyeok Shim, Myoung-Gyu Lee, Joonho Lee, Jun-Ho Jung, Bo-Sung Kim, Sung-Bin Won
황병철, 심재혁, 이명규, 이준호, 정준호, 김보성, 원성빈
Korean J. Met. Mater. 2016;54(12):862-874.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.862

Abstract
Since reconstruction of old town in Korea requires high-rise and seismic design construction, many attentions have been paid to high strength seismic reinforced steel bar. In the present paper, technical developments and trends are summarized for developing next-generation seismic reinforced steel bar of grade 700 MPa. Steelmaking process requires high..... More

         Cited By 1
Research Papers
875 The Effects of Cooling Rate on Deformation Mechanism at Room Temperature in Mild Steel
연강에서 상온 변형 기구에 미치는 냉각 속도의 영향
SungSoo Kim, Yoon Sang Lee, Young Suk Kim
김성수, 이윤상, 김영석
Korean J. Met. Mater. 2016;54(12):875-884.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.875

Abstract
The deformation mechanism at room temperature in water quenched (WQ) and furnace cooled (FC) mild steels was investigated in a plane tilted 45° from the tensile direction, using electron back scattered diffraction, XRD, and TEM. The occurrence of (211) twinning was confirmed by pole figures and the slip systems were..... More

      
885 Effects of Alloying Elements on the Corrosion Properties of High Strength Steel in a Sour Environment
사워(Sour) 환경에서 고강도강의 내식성에 미치는 합금원소의 영향
Youngmin Hyun, Heesan Kim
현영민, 김희산
Korean J. Met. Mater. 2016;54(12):885-892.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.885

Abstract
The effects of alloying elements (Mn, Cr, and C) on the corrosion resistance of steel were examined using weight loss test, polarization test in a sour environment, analysis of rust, and the prediction of stable corrosion product. Carbon was found to improve corrosion resistance after 7-day immersion, while manganese and..... More

         Cited By 1
893 Rapid Sintering of Nanocrystalline SiC-Graphene Composites
나노구조 SiC-Graphene 복합재료 급속소결
In-Jin Shon
손인진
Korean J. Met. Mater. 2016;54(12):893-898.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.893

Abstract
The low mechanical properties of SiC limit its wide application despite many attractive properties. To improve the mechanical properties, a second phase has been generally added to make a nanostructured composite. In this respect, graphene was evaluated as the reinforcing agent of SiC. SiC-graphene composites were sintered within 2 min..... More

         Cited By 1
899 Effect of Bonding Pressure and Bonding Time on the Tensile Properties of Cu-Foam / Cu-Plate Diffusion Bonded Joint
Cu foam / Cu plate 간 고상확산접합부의 인장성질에 미치는 접합압력과 유지시간의 영향
Sang-Ho Kim, Hoe-Jun Heo, Tae-Jin Yoon, Chung-Yun Kang
김상호, 허회준, 윤태진, 강정윤
Korean J. Met. Mater. 2016;54(12):899-907.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.899

Abstract
Open cell Cu foam, which has been widely utilized in various industries because of its high thermal conductivity, lightweight and large surface area, was successfully joined with Cu plate by diffusion bonding. To prevent excessive deformation of the Cu foam during bonding process, the bonding pressure should be lower than..... More

      
908 Kinetics of Intermetallic Compounds Growth Induced by Electromigration of Sn-0.7Cu Solder
Electromigration에 의한 Sn-0.7Cu 솔더 금속간화합물 성장 예측
Min-Hyeok Heo, Namhyun Kang, Seonghun Park, Jun-Ki Kim, Won Sik Hong
허민혁, 강남현, 박성훈, 김준기, 홍원식
Korean J. Met. Mater. 2016;54(12):908-915.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.908

Abstract
The reliability of printed circuit boards (PCB) has emerged as a critical concern as the size of solder bump decreases and current density to solder bump increases by fine pitch formation. The main failure mode of solder bumps is open-circuits due to void formation as intermetallic compounds (IMC) grow, mainly..... More

         Cited By 1
916 Hydrogen Sorption of Pure Mg and Niobium (V) Fluoride-Added Mg Alloys Prepared by Planetary Ball Milling in Hydrogen
Hye Ryoung Park, Young Jun Kwak, Seong Ho Lee, Myoung Youp Song
Korean J. Met. Mater. 2016;54(12):916-924.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.916

Abstract
In this work, niobium (V) fluoride was selected as an additive to heighten the hydrogen sorption rates of Mg. Specimens of pure Mg, 5 wt% niobium fluoride-added Mg, and 10 wt% niobium fluoride-added Mg were prepared by planetary ball milling in hydrogen. The hydrogen sorption properties of the specimens were..... More

         Cited By 3
925 Effect of Aging Time and Temperature on Microstructure and Mechanical Properties of Ti-39Nb-6Zr Alloy
Ti-39Nb-6Zr 합금의 시효처리를 통한 미세조직 및 기계적 특성 제어
Hyun Jun Kwon, Ka Ram Lim, Yong Tae Lee, Dong Geun Lee, Jun Hee Lee, Seung Eon Kim
권현준, 임가람, 이용태, 이동근, 이준희, 김승언
Korean J. Met. Mater. 2016;54(12):925-930.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.925

Abstract
The aim of this study is to optimize the microstructure and mechanical properties of Ti-39Nb-6Zr (TNZ40) for bio-implant applications. TNZ40 was designed to have a low elastic modulus (~40 GPa) and good biocompatibility. However, the alloy shows relatively low strength compared to other titanium alloys for bio-implant. In the present..... More

      
931 Correlation Between Electrical Conductivity and Catalytic Property in 78V2O5-15P2O5-7B2O3 Glass Containing Fe2O3
Fe2O3를 포함한 78V2O5-15P2O5-7B2O3계 유리의 결정화에 따른 전기전도도와 촉매특성의 상관관계
Hwa-Jin Jeong, Jong-hwan Kim, Bong-Ki Ryu
정화진, 김종환, 류봉기
Korean J. Met. Mater. 2016;54(12):931-936.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.931

Abstract
In this study, we established a correlation between the electrical conductivity and catalytic properties of vanadium borophosphate glass containing Fe2O3. Glasses were synthesized in the 78V2O5–15P2O5–7B2O3 ternary-system containing x mol% Fe2O3 (x = 1, 5, 7.5, and 10). Electrical conductivity was measured at 45 ℃ for samples heat-treated at 340..... More

      
937 Evolution of High Tin Bronze Technology in Korea as Observed in Bronze Objects of the Unified Silla Period, Excavated from the National Gyongju Museum Site
한국 방짜기술의 출현과정에 관한 금속학적 연구: 국립경주박물관 부지 출토 통일신라 청동유물을 기준으로
Jang Sik Park, Jin Ok Joo
박장식, 주진옥
Korean J. Met. Mater. 2016;54(12):937-943.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.937

Abstract
Korea is famous for its long history of manufacturing high tin bronze objects of near peritectic composition by the application of forging and rapid cooling at approximately 700 °C. Not much is known, however, of the origin and developmental processes of this technique. Fortunately, valuable evidence for assessing the associated..... More

      
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